摘要
瓦氏雅罗鱼Leuciscus waleckii (Dybowskii)是我国北方地区习见的淡水鱼类。由于它具有耐寒耐盐碱的特性,在达里湖及其它许多高寒盐碱化的湖泊里是主要的经济鱼类。1975—1978年在达里湖(位于内蒙昭乌达盟克什克腾旗境内)渔业资源调查期间,对它的生物学进行了调查研究。
Leuciscus waleckii is a important object of fishery in Dali Lake. Investigation on the biology of this fish was made during the years 1975-1978. Annual rings on the scales formed are the basis of age determination. The average body-lengths were found to be L1 66.0, L2 101.0, L3 121.7, L4 137.9, L5 151.9, L6 166.4, L7 181.6, L8 197.2, L9 213.9, L10 226.5 and L11 252.8 mm. The weight-length relationship is represented by equation. W = 0.00002235 L2.871. The food-analysis of Leuciscus waleckii here confirms that it takes a mixed diet, consisting of animal as well as vegetable material, though the Cladoccre, Copepoda, Chironomid larvae, vegetable and small fishes of various kinds are the chief components. A sex-ratio 41.0(?) % is the normal for adults, but in young fishes the sex-frequencies are nearly equal. Generally, the individual of 3 to 4 yea-old and about 130-155mm in standard length has attained sexual maturity. The individual absolute fecundity varies from 5,400 to 51,825, 10,232 on the average, Spawning occur in April to May when the water temperature rose 6℃ to 16℃. Fertilized eggs for adhering to the aquatic plants and hatch in about eleven days at a average temperature of 14℃. The larval fish after hatching have grown to body-length 55 to 60mm on this year autumen,
作者
解玉浩
傅平
朴笑平
Hsie Yuhao;Fu Ping;Pu Xiaoping(Research Institute of freshwater fisheries of Liaoning province)
